Electrolysis — GCSE Chemistry Revision
Revise Electrolysis for GCSE Chemistry. Step-by-step explanation, worked examples, common mistakes and exam-style practice aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), SQA, IB, AP.
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Go to Electrolysis of Aqueous SolutionsWhat is Electrolysis?
Electrolysis is the process of breaking down an ionic compound, either molten or in solution, by passing an electric current through it. The substance being broken down is called the electrolyte. The current is passed through via two electrodes: a positive one called the anode, and a negative one called the cathode.
Board notes: Electrolysis is a major topic for all exam boards. You must understand the basic setup, the terminology (electrolyte, electrode, anode, cathode), and be able to predict the products of the electrolysis of simple molten ionic compounds. The electrolysis of aqueous solutions is a more advanced, higher-tier topic.
Step-by-step explanationWorked example
In the electrolysis of molten lead(II) bromide (PbBr₂), the lead ions (Pb²⁺) are attracted to the negative cathode, where they gain two electrons to become lead atoms (Pb). The bromide ions (Br⁻) are attracted to the positive anode, where they each lose one electron to become bromine atoms, which then pair up to form bromine molecules (Br₂).
Mini lesson for Electrolysis
1. Understand the core idea
Electrolysis is the process of breaking down an ionic compound, either molten or in solution, by passing an electric current through it. The substance being broken down is called the electrolyte.
Can you explain Electrolysis without copying the notes?
2. Turn it into marks
In the electrolysis of molten lead(II) bromide (PbBr₂), the lead ions (Pb²⁺) are attracted to the negative cathode, where they gain two electrons to become lead atoms (Pb). The bromide ions (Br⁻) are attracted to the positive anode, where they each lose one electron to become bromine atoms, which then pair up to form bromine molecules...
Underline the method, evidence, or command-word move that would earn credit in GCSE Chemical Changes.
3. Fix the likely mark leak
Watch for this mistake: Confusing the anode and cathode. A useful mnemonic is PANIC: Positive Anode, Negative Is Cathode.
Write one correction rule before doing another practice question.
Practise this topic
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Electrolysis practice questions
These are original StudyVector questions for revision practice. They are not official exam-board questions.
Question 1
In one GCSE sentence, explain what Electrolysis is testing.
Answer: Electrolysis is the process of breaking down an ionic compound, either molten or in solution, by passing an electric current through it. The substance being broken down is called the electrolyte.
Mark focus: Precise definition and topic focus.
Question 2
A Electrolysis question uses an unfamiliar context. What should the answer do before adding detail?
Answer: It should name the process, variable, equation, particle model, or evidence being tested, then explain the result using precise scientific vocabulary.
Mark focus: Method selection and command-word control.
Question 3
A student makes this mistake: "Confusing the anode and cathode. A useful mnemonic is PANIC: Positive Anode, Negative Is Cathode." What should their next repair task be?
Answer: Do one Electrolysis question and review the mistake type.
Mark focus: Error correction and next-step practice.
Electrolysis flashcards
Core idea
What is the main idea in Electrolysis?
Electrolysis is the process of breaking down an ionic compound, either molten or in solution, by passing an electric current through it. The substance being broken down is called the electrolyte.
Common mistake
What mistake should you avoid in Electrolysis?
Confusing the anode and cathode. A useful mnemonic is PANIC: Positive Anode, Negative Is Cathode.
Practice
What is one useful practice task for Electrolysis?
Answer one Electrolysis question and review the mistake type.
Exam board
How should you use board notes for Electrolysis?
Electrolysis is a major topic for all exam boards. You must understand the basic setup, the terminology (electrolyte, electrode, anode, cathode), and be able to predict the products of the electrolysis of simple molte...
Common mistakes
- 1Confusing the anode and cathode. A useful mnemonic is PANIC: Positive Anode, Negative Is Cathode.
- 2Forgetting that the electrolyte must be molten or in solution for the ions to be free to move and conduct electricity.
- 3Not being able to predict the products of electrolysis. Remember that positive ions (cations) move to the cathode and negative ions (anions) move to the anode.
Electrolysis exam questions
Exam-style questions for Electrolysis with mark-scheme style solutions and timing practice. Aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), SQA, IB, AP specifications.
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Step-by-step method
Step-by-step explanation
4 steps · Worked method for Electrolysis
Core concept
Electrolysis is the process of breaking down an ionic compound, either molten or in solution, by passing an electric current through it. The substance being broken down is called the electrolyte. The …
Frequently asked questions
What happens at the cathode?
At the cathode (negative electrode), positive ions gain electrons. This process is called reduction.
What happens at the anode?
At the anode (positive electrode), negative ions lose electrons. This process is called oxidation.